SkLumaColorFilter.cpp revision 9fa60daad4d5f54c0dbe3dbcc7608a8f6d721187
16c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org/* 26c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org * Copyright 2013 Google Inc. 36c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org * 46c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org * Use of this source code is governed by a BSD-style license that can be 56c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org * found in the LICENSE file. 66c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org */ 76c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 86c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#include "SkLumaColorFilter.h" 96c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 106c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#include "SkColorPriv.h" 116c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#include "SkString.h" 126c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 136c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#if SK_SUPPORT_GPU 146c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#include "gl/GrGLEffect.h" 15848faf00ec33d39ab3e31e9a11d805cae6ac6562bsalomon#include "gl/GrGLShaderBuilder.h" 166c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#include "GrContext.h" 176c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#include "GrTBackendEffectFactory.h" 186c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#endif 196c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 206c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.orgvoid SkLumaColorFilter::filterSpan(const SkPMColor src[], int count, 216c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org SkPMColor dst[]) const { 226c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org for (int i = 0; i < count; ++i) { 236c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org SkPMColor c = src[i]; 246c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 25d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org /* 26d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org * While LuminanceToAlpha is defined to operate on un-premultiplied 27d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org * inputs, due to the final alpha scaling it can be computed based on 28d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org * premultipled components: 29d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org * 30d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org * LumA = (k1 * r / a + k2 * g / a + k3 * b / a) * a 31d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org * LumA = (k1 * r + k2 * g + k3 * b) 32d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org */ 33d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org unsigned luma = SkComputeLuminance(SkGetPackedR32(c), 34d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org SkGetPackedG32(c), 35d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org SkGetPackedB32(c)); 36d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org dst[i] = SkPackARGB32(luma, 0, 0, 0); 376c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org } 386c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org} 396c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 406c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.orgSkColorFilter* SkLumaColorFilter::Create() { 416c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org return SkNEW(SkLumaColorFilter); 426c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org} 436c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 449fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reedSkLumaColorFilter::SkLumaColorFilter() : INHERITED() {} 456c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 469fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reed#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING 479fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reedSkLumaColorFilter::SkLumaColorFilter(SkReadBuffer& buffer) : INHERITED(buffer) {} 489fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reed#endif 496c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 509fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reedSkFlattenable* SkLumaColorFilter::CreateProc(SkReadBuffer&) { 519fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reed return SkNEW(SkLumaColorFilter); 526c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org} 536c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 549fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reedvoid SkLumaColorFilter::flatten(SkWriteBuffer&) const {} 559fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reed 560f10f7bf1fb43ca6346dc220a076773b1f19a367commit-bot@chromium.org#ifndef SK_IGNORE_TO_STRING 576c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.orgvoid SkLumaColorFilter::toString(SkString* str) const { 586c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org str->append("SkLumaColorFilter "); 596c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org} 606c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#endif 616c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 626c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#if SK_SUPPORT_GPU 636c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.orgclass LumaColorFilterEffect : public GrEffect { 646c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.orgpublic: 6583d081ae1d731b5039e99823620f5e287542ee39bsalomon static GrEffect* Create() { 6655fad7af61c21d502acb9891d631e8aa29e3628cbsalomon GR_CREATE_STATIC_EFFECT(gLumaEffect, LumaColorFilterEffect, ()); 6755fad7af61c21d502acb9891d631e8aa29e3628cbsalomon return SkRef(gLumaEffect); 686c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org } 696c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 706c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org static const char* Name() { return "Luminance-to-Alpha"; } 716c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 726c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE { 736c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org return GrTBackendEffectFactory<LumaColorFilterEffect>::getInstance(); 746c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org } 756c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 766c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org virtual void getConstantColorComponents(GrColor* color, 776c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org uint32_t* validFlags) const SK_OVERRIDE { 78d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org // The output is always black. 79d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org *color = GrColorPackRGBA(0, 0, 0, GrColorUnpackA(*color)); 80d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org *validFlags = kRGB_GrColorComponentFlags; 816c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org } 826c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 836c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org class GLEffect : public GrGLEffect { 846c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org public: 856c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org GLEffect(const GrBackendEffectFactory& factory, 866c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org const GrDrawEffect&) 876c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org : INHERITED(factory) { 886c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org } 896c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 9063e99f7a03b2ac90ae7a00232674fd39c0bdcc68bsalomon static void GenKey(const GrDrawEffect&, const GrGLCaps&, GrEffectKeyBuilder* b) {} 916c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 926c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org virtual void emitCode(GrGLShaderBuilder* builder, 936c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org const GrDrawEffect&, 9463e99f7a03b2ac90ae7a00232674fd39c0bdcc68bsalomon const GrEffectKey&, 956c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org const char* outputColor, 966c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org const char* inputColor, 976c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org const TransformedCoordsArray&, 986c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org const TextureSamplerArray&) SK_OVERRIDE { 996c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org if (NULL == inputColor) { 100824c346b6e0e114063c1a8ad4ba7c3a669ee2cffcommit-bot@chromium.org inputColor = "vec4(1)"; 1016c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org } 1026c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 1036c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org builder->fsCodeAppendf("\tfloat luma = dot(vec3(%f, %f, %f), %s.rgb);\n", 1046c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org SK_ITU_BT709_LUM_COEFF_R, 1056c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org SK_ITU_BT709_LUM_COEFF_G, 1066c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org SK_ITU_BT709_LUM_COEFF_B, 1076c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org inputColor); 108d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org builder->fsCodeAppendf("\t%s = vec4(0, 0, 0, luma);\n", 109d494b09f554d470fc6411d0924879bbfb0cb0e95commit-bot@chromium.org outputColor); 1106c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 1116c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org } 1126c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 1136c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org private: 1146c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org typedef GrGLEffect INHERITED; 1156c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org }; 1166c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 1176c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.orgprivate: 1186c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE { 1196c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org return true; 1206c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org } 1216c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org}; 1226c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org 12397b9ab72cd5ee0cba4692082737266376425f27cbsalomonGrEffect* SkLumaColorFilter::asNewEffect(GrContext*) const { 1246c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org return LumaColorFilterEffect::Create(); 1256c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org} 1266c1ee2d4e727357451c8a6fcf4a08e75890b5d6dcommit-bot@chromium.org#endif 127